Add gif

Author: Florian Bernard

README.md

@@ -28,6 +28,9 @@ You can know where a card is with the ```getCardOffset``` function in JavaScript
 
 Use arrows with props ```showArrows={true}```
 
+## Example demo
+![react-card-scroll](https://cloud.githubusercontent.com/assets/11945259/15610281/bcbcd0b2-2424-11e6-9e65-304a690f467e.gif)
+
 ## Some (very) basic usage
 ```jsx
 <CardScroll ref="cardScroll">